Specification Bluetooth protocol: version 1.2 2.4 GHz wireless Bluetooth frequency. Bluetooth range: 10 meters. Using the hands free Bluetooth profile, it is compatible with Audio Gateway (In/ Out) for all Bluetooth enabled PCs, PDAs, & Cellphones. Designed to be used in the car Users can talk on the phone while driving Simply plug the car kit into the car cigarette lighter & connect to the Mobile phone Activate voice dial & adjust volume by pressing a button